The phrase "a length of some" is not correct and does not convey a clear meaning in written English.
It may be intended to refer to a specific measurement or quantity, but it lacks clarity and context.
Example: "The project requires a length of some material, but we need to determine the exact amount needed."
Alternatives: "a certain length of" or "a specific length of".
The Chaobai has a length of some 170 miles (275 km), and the New Chaobai has a length of about 110 miles (180 km).
These ships, with a length of some 330 metres (1,100 feet), have capacities between 200,000 and 320,000 dwt.
It is one of the longest rivers in the world, with a length of some 2,000 miles (3,200 km).
The yueqin, which evolved from the ruan, has a length of some 18 inches (about 45 cm), with a short neck and a round resonator that is some 12 inches (30 cm) in diameter.
Small crustaceans, including more than 100 species of minute copepods, form the bulk of the animal life, followed by small mollusks, jellyfish, and polyps, and other invertebrate animals ranging from single-celled radiolaria to large Portuguese man-of-war, the tentacles of which may reach a length of some 165 feet (50 metres).
The individual Hox clusters of gnathostomes have a length of some 100,000nt and share besides a set of homologous genes also a substantial amount of conserved non-coding DNA [ 35] that predominantly consists of transcription factor binding sites.
Participants allocated to day hospital recorded a length of stay some 50 days longer (78 versus 28 days) and received on average 44 more therapy sessions (68 versus 24) than patients who received home rehabilitation.
This isn't one of those games though, this is The Last of Us, and your arsenal right now consists of a brick and a length of drainpipe with some scissors taped to the end.
This screen was made from two custom made L-brackets, a length of threaded steel rod, and some spare window shade vinyl.
A length of wood, also pink, leans on some fishing line strung across the space.
Sea mice are usually 7.5 15 centimetres (3 6 inches) long; however, some attain a length of 30 centimetres (12 inches).
